Adjustable stand for rotatable balances



yPatented Nov. 4, 1930 UNITED STATES WILLY PAULfJENNY, or sTRAsBURG, omo, Assreioia To TME FIRM EXrLomlT19N Y l G. M. B. H.. oF HANOVER, GERMANY ADJUSTABLE STAND FOR ROTATAB'LE BALANCES Application filed Januaryv 16, 1929, Serial N'o. 332,899, and in Germany January 9, 1928.

They present invention relates to an adjustable stand for a rotatable balance for eXecut`- ing geophysical measurements that is such measurements which try to establish the na.- ture of the ground in regard to its homogeneousness by determining the local attraction of masses by means of two exactly equal weights suspended at different heights on both ends of a balance beam according to the Eotvs K principle.

The annexed drawing .represents a sectional elevation of the adjustable stand for the rotatable balance. According to the drawing there is a circular base plate 1 fixed to the end of a` cylindrical hollow column 2 on the outside of which a.y fourfold thread 3 is cut.y This screw. thread iits exactly a corresponding female thread of a tube 4 kwhich is revolvably heldL within a vertical stand 5 k bolted to a pedestal 6 by means of the bolts 13. The tube 4 rests with an annular member secured to its top end on a. ball bearing 7 carried by the top of the stand 5 and rests with its bottom on a second ball bearing 8 carried by a bottom plate 9 closing the underside of the pedestal 6. The tube 4 can be rotated by means of a conical gear wheel 10 which is engaged by a pinion 11 keyed to au axis 12 provided with a socket for a socketwrench. The revolving of said tube is prevented in one direction by a spring operated pawl 14 engaged into the ratchet 15 provided on the top side of gear wheel 10.

In order to retainthe column 2 from roY tation while .tube 4 is revolved and in order to produce by this rotation the raising of column 2 and ofthe base plate 1 a vertical shaft 16 is arranged concentrically to the tube 4 and revolvably within the hub of gear wheel 10. 40 This shaft 16 is provi-ded with a longitudi-y nal groove 17 and engages thereby a cog projecting from a collar 18 fixed to the inside of the column 2. y

The shaft 16 is supported by a. step bearing l 19 and is drivenby means of a bevel wheel 20 ,meshing with a. pinion .2.10.11 an axis 2,2- This i axis journalled in a bottom plate 9 rece'ivesits revolving movement bymeans of the lconical gears 23,124 from a vertical shaft25, Awhich is connected by means of two other p inions 26 is represented only inv part. It controls a vregulating device the power of said device :being employed ,taksen up the oscillations Of a pendulum 31.1 The length V0f' this Pehdh- ,5

lum may be increased ordiminished in order to adjust theyrate .of ,descent ,of itlielcolumn with the `:base plate l1.

The represented arrangement is r:operated as' follows.: When the hieashhhgtlevice s- ,molmted the wrench .tlthgfthefsquale 0f the ,here above and Lby means of the regulating device, the Apehdalum .hf whchls llhedht this moment. v

The turning of the tube 4 will cause arisi ving movement of column 2, of base Yplate 1 and of the balance vmountedthereon 'The `rising ,movement will be stopped when vthe Alcog of the collar 18 strikesagainstthe .endy Aof the groove 17. Nowthe pendulum isreleased'andfstarted by a tcuch andthe whole mechanism begins running. Under theV effect fof .its weight y,increased kby :that of `the 'balance'` therolumn v2 begins to .sinh vwith va speed which isa` function ofthe length of the pendulum 3 1. At thesame 4time the column will turnat a speed which isdetermined ,by :the pitch `05.511,1@ thread 3f. llhe :tube fi -however isblocked by the pawl 14. The moremehtconbnuesuhtilitheithhe iS at the end of its path- ;Ih thismlhhlehtthe .Snkngas :welles ,the reththg Increment Of the base plate will be stopped. What Ilai-mlis: l

- and27 Withagearing 2 8and 2749. Tliisgearing 1. In an adjustable stand for a rotatable balance for executing geophysical measurement, a support of the measuring device, means for simultanenously turning and sinking said support and means for regulating such turning and sinking movements.

2. In an adjustable stand for a rotatable balance for executing geophysical measurements, a support of the measuring device comprising a tubular vertical stand, two concentricall arranged tubes held yrotatably Within said stand, the inner tube constituting the carrier of the measuring device, steep itched screw threads as interlocking means Between said inner and outer tube so as to adapt said inner tube to turn and sink simultaneously inside of the outer tube under the f eifect of its dead weight and means for regulating such turning and sinking of the Linner tube.

3. In an adjustable stand for a rotatable balance for executing geophysical measurements, a support of the measuring device comprising a. tubular vertical stand, two concentrically arranged tubes held rotatably within said stand, the inner tube constituting the carrier of the measuring device steeppitched screw threads as interlocking means between said inner and outer tube so as to adapt said inner tube to turn and sink simultaneously inside of the outer tube under the efect of its dead weight, a pedestal constituting the base of said stand, a grooved shaft standing in a stepfbearing of said pedestal and held slidably butnot rotatably withing said inner tube, a pendulum regulator 'attached to said pedestal and capable of controlling the amount of the two movements of said inner tube and an intermediate-transmission gear between grooved shaft and regulator. v

4. In an adjustable stand for a rotatable balance for executing geophysical measurements, a support of the measuring device comprising a tubular vertical stand, two concentrically arranged tubes held rotatably within said stand, the inner tube constituting the carrier of the measuring device, steep itched screw threads and interlocking means etween said inner and outer tube so as to adapt said inner tube to turn and sink simultaneously inside of the outer tube under the eiect of its dead weight, a pedestal constituting the base of said stand, a grooved shaft standing in a step bearing of said pedestal and held slidably but not rotatably within said inner tube, a pendulum regulator attached to said pedestal and capable of controlling the amount of the two movements of said inner tube, hand controlled means located in the pedestal and adapted to turn the outer of said tubes, and a ratchet-device securing thefturning of said tube in one direction only.

5. In an adjustable stand for a rotatable DR. IVILLY PAUL JENNY.

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